Bio II Material

Bio II Material - Next up in UNIT II Patterns of...

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Unformatted text preview: Next up in UNIT II: Patterns of Inheritance How are genes and the traits for which they code passed along from parents to offspring? Father and son sisters brothers twins Family Mom and offspring Monday, June 13, 2011 SLIDE SET VI Outline I. Mendel - A New Theory of Inheritance A. Who was Mendel? B. What did Mendel know? C. Plant breeding II. Mendel's work A. Monohybrid cross B. Interpretation in modern terms C. Quantitative results D. The dihybrid cross E. Summary of Mendel's Rules III. Probability Theory and Patterns of Inheritance A. DeFnitions B. Rules for probability C. Application to the dihybrid cross Monday, June 13, 2011 SLIDE SET VI OUTLINE (cont’d.) IV. Extensions of (and exceptions to) Mendel’s rules A. Partial dominance 1. incomplete dominance 2. co-dominance B. More than 2 possible alleles at a locus 1. human ABO blood groups C. Pleiotropy D. Polygenic inheritance 1. epistasis 2. human skin color 3. human eye color Monday, June 13, 2011 The Homunculus vs. Pangenesis Darwin- gemules (info parts of body) go to reproductive organs to pass on Monday, June 13, 2011 Gregor Mendel (1822-1884)- an Austrian monk-lived on farm, monastery Common pea plant ( Pisum sativum ) http://anthro.palomar.edu/mendel/mendel_1.htm Why was he smart to use pea plants to study inheritance?- had simple traits-easy to control breeding Monday, June 13, 2011 Fig. 14.2 How controlled plant breeding is accomplished.-stamen- plant male reproductive organ-pistil-plant female reproductive organ-ovary becomes fruit-seed= embryo Monday, June 13, 2011 REASONS FOR MENDEL’S SUCCESS Monday, June 13, 2011 REASONS FOR MENDEL’S SUCCESS 1. Used an organism (pea plant) that: Monday, June 13, 2011 REASONS FOR MENDEL’S SUCCESS 1. Used an organism (pea plant) that:- can both self (control heredity) and cross- fertilize Monday, June 13, 2011 REASONS FOR MENDEL’S SUCCESS 1. Used an organism (pea plant) that:- can both self (control heredity) and cross- fertilize- produces MANY offspring (= seeds) Monday, June 13, 2011 REASONS FOR MENDEL’S SUCCESS 1. Used an organism (pea plant) that:- can both self (control heredity) and cross- fertilize- produces MANY offspring (= seeds)- has a relatively short generation time (life cycle) Monday, June 13, 2011 REASONS FOR MENDEL’S SUCCESS 1. Used an organism (pea plant) that:- can both self (control heredity) and cross- fertilize- produces MANY offspring (= seeds)- has a relatively short generation time (life cycle) 2. Subjected data to quantitative analysis Monday, June 13, 2011 REASONS FOR MENDEL’S SUCCESS 1. Used an organism (pea plant) that:- can both self (control heredity) and cross- fertilize- produces MANY offspring (= seeds)- has a relatively short generation time (life cycle) 2. Subjected data to quantitative analysis 3. Used an organized, systematic (i.e., “scienti¡c”) approach: Monday, June 13, 2011 REASONS FOR MENDEL’S SUCCESS- studied several different plant characteristics (or “traits”) (Table 14.1) 1. Used an organism (pea plant) that:...
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Bio II Material - Next up in UNIT II Patterns of...

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